单词 | paludina |
释义 | Paludinan. Zoology. A genus of freshwater snails (pond snails), now usually called Viviparus; (also paludina) a snail of this genus. ΘΚΠ the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > class Gastropoda > [noun] > superorder Branchifera > order Prosobranchiata > section Holostomata > family Paludinidae > genus Paludina Paludina1823 1823 Philos. Trans. (Royal Soc.) 113 394 I am unable to distinguish this genus from Paludina. 1831 H. McMurtrie tr. G. Cuvier Animal Kingdom II. 361 The ocean produces some shells which only differ from the Paludinæ in being thick. 1833 C. Lyell Princ. Geol. III. 244 Where the same Planorbes, Paludinæ, and Limnei occur. 1884 Amer. Naturalist 18 1050 The young of fresh-water mollusks do not enter upon a free existence until they are similar to their parents, and Paludina is viviparous. 1902 C. J. Cornish Naturalist on Thames 15 The paludinas being large, thick-striped shells. 1963 G. A. Kerkut Borradaile & Potts's Invertebrata (rev. ed.) xv. 613 Paludina..is a fresh-water form of common occurrence in this country which still preserves the ctenidium. 1971 G. de Beer Embryos & Ancestors (ed. 3) vi. 57 The inner whorls of Tulotoma's shells are smooth, as are the inner whorls of the shell of Paludina. Compounds Geology. attributive. Designating limestone or other deposits characterized by abundant fossil shells of the genus Paludina ( Viviparus). ΚΠ 1876 Amer. Naturalist 10 694 The species with highly complicated ornamentation were variously derived by descent..from the simple and unornamented Vivipara achatinoides of the Congerien-schichten, which underlies the Paludina beds. 1895 G. Allen Woman who Did i. 1 Ridge behind ridge, the long low hills of paludina limestone stood out in successive tiers. 1939 S. W. Wooldridge & D. L. Linton Struct., Surface & Drainage S.E. Eng. (Inst. Brit. Geographers Publ. No. 10) iii. 24 It is probable that its line is indicated by the inflexion of the outcrop and scarp of the Paludina limestone about five miles south of Redhill. 1980 P. C. Hall Sussex Plant Atlas 12 Some low ridges of slightly higher ground composed of what is known as ‘paludina limestone’, from which can be quarried a useful rock known as Sussex marble which can be seen in Chichester cathedral. 1988 Philos. Trans. (Royal Soc.) B. 318 568 Intercalated in these gravels are the so-called ‘Paludina’ beds of Holsteinian age. This entry has been updated (OED Third Edition, March 2005; most recently modified version published online March 2022). < |
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